<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
<script type="text/javascript">
          /*
     * Draw a Oval
     * The following is the formula of Oval.
     * All dots is drawn by it.
     * x = r*a*cosθ　(0 <= θ <= 2π)
     * y = r*b*sinθ　(0 <= θ <= 2π)
     * b*b + r*r = a*a //Pythagoras Theorem
     */
    var Circle = {
        centre_of_circle : {x:200,y:200},
        radius : 12,
        dot : function(x,y,w){
            return "<div id='dot_"+x+y+"' style='display:none;font-size:0;width:"+w+"px;height:"+w+"px;position:absolute;background-color:#000;top:"+(y)+"px;left:"+(x)+"px'></div>";
        },
        draw : function(){
            var s = "",
                dots = 500,
                a = 15,
                b = 9,
                dotsArr = [];
            for(var i = 0; i < dots; i++){
                var x = Circle.centre_of_circle.x+Circle.radius*Math.cos(i*2*Math.PI/dots)*a;
                var y = Circle.centre_of_circle.y+Circle.radius*Math.sin(i*2*Math.PI/dots)*b;
                s += Circle.dot(x, y, 2);
                dotsArr.push({"y":y,"x":x});
            }
            document.body.innerHTML = s;
            return dotsArr;
        }
    }
    window.onload = function(){
        var dots = Circle.draw();
        var count = 0;
        var t = window.setInterval(function(){
           document.getElementById("dot_"+dots[count].x+dots[count].y).style.display = "block";
           count++;
           if(count >= dots.length) window.clearInterval(t);
        },1);
    }
</script>
</head>

<body>
</body>
</html>